Reprinted from http://www.pravada.ru
Nikita Khrushchev gave Russia’s Crimea away to Ukraine in only 15 minutes (Pravda.ru, 2009)

USSR’s Nikita Khrushchev gave Russia’s Crimea away to Ukraine in only 15 minutes
The Presidium of the Supreme Council of the Soviet Union passed the decree to hand over the Crimean region from the structure of the Russian Soviet Socialist Republic (SSR) to the Ukrainian SSR within the Soviet Union. Then-Soviet leader, Nikita Khrushchev, virtually gave Crimea away to Ukraine.
The delivery of the region from the Russian SSR to the Ukrainian SSR was just a formality during the years of the “indestructible” Soviet Union. Ukraine received such a gift on the occasion of the 300th anniversary since its unification with Russia. It could never occur to anyone back in those days that the USSR would collapse, and that Ukraine would no longer be a part of it.
Historians have a very simple explanation to Nikita Khrushchev’s generosity. He came to power after the death of Joseph Stalin, unmasked his cult and condemned repressions. However, Khrushchev was involved in a number of repression-related affairs before. He was conducting a struggle against “people’s enemies” when he served as the First Secretary of the Central Committee of the Ukrainian Communist Party from 1938 to 1947 to win the support of the Ukrainian leadership. That is why he gave the resort peninsula on the Black Sea coast to the republic.
Khrushchev informed his comrades of the decision to deliver Crimea to Ukraine incidentally, on the way to lunch. “Yes, comrades, there is an opinion to deliver Crimea to Ukraine,” he said casually. No one dared to express any protests, because a word of the first face of the Communist Party was law.

The Supreme Council of Russia ruled in 1992 that the Crimean region had been delivered to Ukraine illegitimately.
References
Pravda.ru. (2009, February 19). History & Traditions. Retrieved from Pravda.ru: http://english.pravda.ru/history/19-02-2009/107129-ussr_crimea_ukraine-0/